Description
The LTC1666/LTC1667/LTC1668 are 12-/14-/16-bit, 50Msps differential current output DACs implemented on a high performance BiCMOS process with laser trimmed, thin-film resistors. The combination of a novel current-steering architecture and a high performance process produces DACs with exceptional AC and DC performance. The LTC1668 is the first 16-bit DAC in the marketplace to exhibit an SFDR (spurious free dynamic range) of 87dB for an output signal frequency of 1MHz.Operating from ±5V supplies, the LTC1666/LTC1667/LTC1668 can be configured to provide full-scale output currents up to 10mA. The differential current outputs of the DACs allow single-ended or true differential operation. The –1V to 1V output compliance of the LTC1666/LTC1667/LTC1668 allows the outputs to be connected directly to external resistors to produce a differential output voltage without degrading the converter’s linearity. Alternatively, the outputs can be connected to the summing junction of a high speed operational amplifier, or to a transformer.
The LTC1666/LTC1667/LTC1668 are pin compatible and are available in a 28-pin SSOP and are fully specified over the industrial temperature range.
Features
- 50Msps Update Rate
- Pin Compatible 12-Bit, 14-Bit and 16-Bit Devices
- High Spectral Purity: 87dB SFDR at 1MHz fOUT
- 5pV-s Glitch Impulse
- Differential Current Outputs
- 20ns Settling Time
- Low Power: 180mW from ±5V Supplies
- TTL/CMOS (3.3V or 5V) Inputs
- Small Package: 28-Pin SSOP
Applications
- Cellular Base Stations
- Multicarrier Base Stations
- Wireless Communication
- Direct Digital Synthesis (DDS)
- xDSL Modems
- Arbitrary Waveform Generation
- Automated Test Equipment
- Instrumentation
Package Variations
| Part Number | Package | Pins | Temp |
| LTC1668CG | SSOP | 28 | C |
| LTC1668CG#PBF | SSOP | 28 | C |
| LTC1668CG#TR | SSOP | 28 | C |
| LTC1668CG#TRPBF | SSOP | 28 | C |
| LTC1668IG | SSOP | 28 | I |
| LTC1668IG#PBF | SSOP | 28 | I |
| LTC1668IG#TR | SSOP | 28 | I |
| LTC1668IG#TRPBF | SSOP | 28 | I |
Packaging
SSOP-28
Typical Application
